US4469106A

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Info

Publication number: US4469106A
Application number: US06/433,931
Authority: US
Inventors: Norio Harui
Original assignee: Advanced Technology Laboratories Inc
Current assignee: Advanced Technology Laboratories Inc
Priority date: 1982-09-02
Filing date: 1982-10-12
Publication date: 1984-09-04
Anticipated expiration: 2002-09-02
Also published as: EP0102800A2; EP0102800A3

Abstract

A needle guide for use with a medical ultrasonic scanning apparatus includes a pivoting plate on a fixed mounting plate. The mounting plate is attached to an ultrasonic scanhead whereby a surface of the mounting plate is in the plane of the ultrasound scan. An adjustable pivoting plate on the mounting plate includes at least one needle aligner, which preferably has a groove formed therein. The pivoting plate can be pivoted and locked into position on the mounting plate. An idler plate, containing an idler roller is spring mounted on the pivoting plate. The idler plate can be pivoted, whereby the idler roller moves away from the guide needle aligners. A raised wall on the pivoting plate prevents an improperly placed needle from puncturing a sterile sheath applied over the scanhead, such as in a brain scan. Thus a needle, such as a biopsy needle can be placed between the idler roller and the needle aligner and will be held in place by the spring tension on the idler roller.

Description

BACKGROUND OF THE INVENTION

This is a continuation-in-part of U.S. Pat. application Ser. No. 414,141, filed Sept. 2, 1982, now abandoned.

The present invention relates to a needle guide for use with medical ultrasonic scanning apparatus. In particular, the present apparatus is a guide for a needle, such as a biopsy needle. The guide is intended to be mounted on an ultrasonic scanhead.

Heretofore, ultrasonic scanners, of the type used in medical diagnostic examinations have been well known. Such scanners are used to produce, on the screen of a cathode ray tube (CRT), a two-dimensional, cross-sectional image of a body region being scanned. Ultrasonic scanners are also used to aid in the insertion of needles during medical procedures, such as the aspiration of fluids from an interior body region or the performance of a biopsy. In such cases, the scanner interrogates the affected body region while the needle is being inserted, thereby producing on the screen of the CRT an image representing the relative positioning of the needle and the internal body structure of the region.

When an ultrasound scanner utilizes a rotating or oscillating transducer, the sector scan which is produced corresponds to a slice through the body portion taken in a plane corresponding to the axis of transmission and reception of ultrasound from the transducer. Thus, in order to observe a body organ into which a needle is being inserted, while at the same time observing the needle which is being inserted in order to accurately place it, it is necessary that the needle be inserted in the plane of the slice corresponding to the sector scan being produced. It would, therefore, be desirable to have a mounting bracket which could mount on an ultrasound scanhead which could hold a needle being inserted in the course of a medical procedure. It would also be desirable if the mounting bracket could be adjusted for various diameter needles and if it could also be adjusted to insert the needles at various angles, all the while providing for the insertion of the needle in the plane of the ultrasound scan. In addition, it would be desirable to produce such a guide apparatus which could be readily applied to or removed from the ultrasound scanhead.

SUMMARY OF THE INVENTION

In accordance with the present invention an adjustable needle guide for an ultrasound scanhead is provided. The needle guide can be readily applied over an ultrasound scanhead and latched securely in place on the scanhead. The needle guide mounting bracket is keyed to the ultrasound scanhead in a manner which assures that a needle inserted into the guide will be in the plane of the ultrasound scan produced by the scanhead. The needle guide contains means for securely holding and easily inserting a needle of various diameters. in addition, the guide includes adjustable means for fixing, in an adjustable manner, the angle at which the needle enters the patient.

The adjustable needle guide for use with a medical ultrasonic scanning apparatus comprises a mounting plate including means for attachment to an ultrasonic scanning apparatus. It further comprises a pivoting plate, pivotally mounted on said mounting plate, whereby the pivoting plate can be moved in the plane of the ultrasonic scan. The pivoting plate includes means for locking it in a fixed angular position on the mounting plate. Needle aligner means, including at least one needle aligner is mounted on the pivoting plate. The needle aligner means is adapted to slideably hold a needle which is biased against the needle aligner means. An idler plate is pivotally mounted on the pivoting plate. The idler plate includes an adjustable needle diameter biasing means. Finally, the device includes spring means which biases the idler plate to move the adjustable needle diameter biasing means toward the needle aligner means on the pivoting plate, whereby a needle placed between the needle aligner means and the adjustable needle diameter biasing means is biased toward the needle aligner means by the spring means.

BRIEF DESCRIPTION OF THE DRAWING

In the drawing:

FIG. 1 is a top view of a first embodiment of the guide of the present invention mounted on an ultrasound scanhead;

FIG. 2 is a front view of the needle guide of FIG. 1;

FIG. 3 is a top view of the mounting plate of the needle guide;

FIG. 4 is a top view of a second embodiment of the guide of the present invention mounted on an ultrasound scanhead; and

FIG. 5 is a front view of the needle guide of FIG. 4.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring generally to FIGS. 1 and 2, a first embodiment of theneedle guide 10 of the preferred embodiment of the invention, is shown. With particular reference to FIG. 1, theneedle guide 10 is shown mounted, using aclamping ring 12 onto anultrasound scanhead 14 of the type generally known in the art. In particular, the ultrasound scanhead may be a Model 725 scanhead of the type made by Advanced Technology Laboratories, Inc. of Bellevue, Wash. Theultrasound scanhead 14 includes a rounded shoulder 16 (shown in shadow in FIG. 1). At one point in the circumference in theshoulder 16 there is a notch which matches a keyed portion 18 (shown in FIG. 2) on theclamp 12. Thus, when theneedle guide 10 is mounted on thescanhead 14, it will always be mounted in a keyed manner. Thus, as will be seen hereafter, theneedle 20 which is held by theguide 10 will always be aligned in the plane of the ultrasound scan produced by thescanhead 14.

Theneedle guide 10 is comprised of amounting plate 22, shown in FIG. 3. Themounting plate 22 is substantially triangular in shape. It includes apivot hole 24 at the apex of the triangle and anarcuate opening 26 at the base of the triangle. Themounting plate 22 is attached to theclamp 12. Theclamp 12 includes ahinge 28 and closing means, such as ascrew mechanism 30. In alternative embodiments of the invention, thescrew mechanism 30 can be replaced by a clasp rather than thescrew type mechanism 30 shown in FIG. 2.

Theneedle guide 10 further comprises apivoting plate 32. Thepivoting plate 32 is mounted on the top surface of themounting plate 22, as shown in FIGS. 1 and 2. Thepivoting plate 32 has a pair of

needle aligners

34, 36 mounted on its upper surface. In the preferred embodiment of the invention, the needle aligners are V-

grooved rollers

34, 36, as shown. However, non-rolling needle aligners could be used instead of the

rollers

34, 36. A threaded rod 38 (shown in shadow in FIG. 2) extends through the curved,arcuate opening 26 in themounting plate 22. Aknurled knob 40 is screwed onto the threadedrod 38 in a manner that allows it to be tightened onto themounting plate 22, whereby thepivoting plate 32 can be locked in any position. Thus, the needle aligners 34, 36 which are mounted on thepivoting plate 22, determine the angle at which theneedle 20 enters the patient, as shown in FIG. 1. By loosening theknurled knob 40 and adjusting the angle of thepivoting plate 32, the position of the pair of

needle aligners

34, 36, relative to thescanhead 14, is adjusted.

Anidler plate 42 is spring mounted on top of thepivoting plate 32. Theidler plate 42 has, on its upper surface, an adjustable needle diameter biasing means, such asidler roller 44 used in the preferred embodiment of the invention. Theidler plate 42 is biased by aspring 46, whereby theidler roller 44 tends to push on one side of theneedle 20 while the two needle aligners 34, 36 on thepivoting plate 32 hold theneedle 20 in a fixed position. One end of the spring is held inspring mounting hole 25, shown in FIG. 3.

In the preferred embodiment of the invention, the pair of

needle aligners

34, 36 on thepivoting plate 32 include

grooved portions

48, 50, as shown in FIG. 2, into which theneedle 20 is urged by theidler roller 44. The arrangement of theidler plate 42 in combination with the spring loadedidler roller 44 and the fixed,

grooved needle aligners

34, 36 on thepivoting plate 32 provides an automatically adjusting apparatus which can hold needles of various diameters. In addition, the particular arrangement used in the present invention provides for "no hands" needle threading and full visibility of theneedle 20 at all times. Thus, a needle can be readily inserted or removed from theneedle guide 10, and no needle size adjustment is required. The freely pivoting

needle aligners

34, 36, and theidler guide 44 provide for a very low friction holding apparatus for theneedle 20 which means that a doctor using the present invention can retain full tactile control over theneedle 20 at all times.

A safety feature of the preferred embodiment of the invention is a raisedwall 27 which prevents someone from inadvertently puncturing the sterile sheath which typically covers ascanhead 14 during a brain scan or a similar procedure. In operation, the raisedwall 27 acts to deflect aneedle 20 which is not properly placed between the

needle aligners

34, 36 and theidler roller 44 away from thescanhead 14.

Referring now to FIGS. 4 and 5, a second embodiment of theneedle guide 10 of the preferred embodiment of the invention, is shown. Theneedle guide 10 of the second embodiment, shown in FIGS. 4 and 5, is substantially identical to the needle guide described with reference to FIGS. 1-3. Accordingly, like reference numerals have been used in FIGS. 4 and 5 to describe like parts, and no further description of those parts will be provided.

In this embodiment of theneedle guide 10, there is a single,elongated needle aligner 52 mounted on the upper surface of the pivotingplate 32. Theelongated needle aligner 52 replaces the pair of

needle aligners

34, 36 used in the first embodiment, described with reference to FIGS. 1 and 2. In this embodiment of the invention, theneedle aligner 52 includes a V-groove 56. There is anarcuate opening 54 in theneedle aligner 56 which permits theidler roller 44 to bias the aneedle 20 into the V-groove 56. As will be recognized by those skilled in the art, in this embodiment of the invention, a narrow diameter, relativelyflexible needle 20 will be supported along a greated portion of its length than it would have been supported along using the first embodiment of the invention. In particular, it will be supported where it is contacted by theidler roller 44. Accordingly, using this embodiment of the invention, aflexible needle 20 will be prevented from bowing. That might not be the situation using the embodiment of the invention shown in FIGS. 1 and 2 which includes two

needle aligners

34, 36 on the pivotingplate 32.

As will be understood by those skilled in the art, either embodiment of the present invention provides two distinct adjustment means. First, the angle of theneedle 20 is adjustable, based upon changing the angle of the pivotingplate 32 relative to the mountingplate 22. Second, the spring biasedidler plate 42, with itsidler guide 44, together with the

needle aligners

34, 36 on the pivotingplate 32, provides an automatic adjustment means for different diameter needles.

Claims

I claim:

1. An adjustable needle guide for use with a medical ultrasonic scanning apparatus comprising:

(a) A mounting plate including means for attachment to an ultrasonic scanning apparatus;

(b) A pivoting plate, pivotally mounted on said mounting plate, whereby said pivoting plate can be moved in the plane of the ultrasonic scan, said pivoting plate including means for locking said pivoting plate in a fixed angular position on said mounting plate;

(c) At least one needle aligner mounted on said pivoting plate, said at least one needle aligner being adapted to slideably hold a needle which is biased against said needle aligner;

(d) An idler plate which is pivotally mounted on said pivoting plate, said idler plate including an adjustable needle diameter biasing means; and

(e) Spring means which biases said idler plate to move said adjustable needle diameter biasing means toward said at least one needle aligner on said pivoting plate, whereby a needle placed between said at least one needle aligner and said adjustable needle diameter biasing means is biased toward said at least one needle aligner by said spring means.

2. The adjustable needle guide of claim 1 wherein said means for attachment of said mounting plate to said ultrasonic scanning apparatus includes means for aligning said mounting plate in the plane of the scan of said ultrasonic scanning apparatus.

3. The adjustable needle guide of claim 1 comprising a pair of needle aligners.

4. The adjustable needle guide of claim 3 wherein said needle aligners are comprised of rollers, the axis of rotation of said needle aligners being substantially orthogonal to the surface of said pivoting plate.

5. The adjustable needle guide of claim 3 wherein said mounting plate further comprises a raised protective wall between said needle aligners and said scanhead, whereby a needle will be deflected away from said scanhead if it is not properly placed between said needle aligners and said adjustable needle diameter biasing means.

6. The adjustable needle guide of claim 3 wherein said adjustable needle diameter biasing means comprises an idler roller, the axis of rotation of said idler roller being substantially orthogonal to the surface of said idler plate.

7. The adjustable needle guide of claim 6 wherein said needle aligners are comprised of rollers, the axis of rotation of said needle aligners being substantially orthogonal to the surface of said pivoting plate.

8. The adjustable needle guide of claim 7 wherein said ultrasonic scanning apparatus is a mechanical sector scanner and said means for attachment of said mounting plate to said ultrasonic scanning apparatus includes a band which encircles one end of said ultrasonic scanning apparatus.

9. The adjustable needle guide of claim 8 wherein said means for aligning said mounting plate in the plane of the scan of said ultrasonic scanning apparatus includes a key on said band.

10. The adjustable needle guide of claim 1 wherein said ultrasonic scanning apparatus is a mechanical sector scanner and said means for attachment of said mounting plate to said ultrasonic scanning apparatus includes a band which encircles one end of said ultrasonic scanning apparatus.

11. The adjustable needle guide of claim 1 wherein said means for aligning said mounting plate in the plane of the scan of said ultrasonic scanning apparatus includes a key on said band.

12. The adjustable needle guide of claim 1 comprising a single needle aligner.

13. The adjustable needle guide of claim 12 wherein said needle aligner is comprised of a single, elongated piece.

14. The adjustable needle guide of claim 13 wherein said needle aligner includes a groove adapted to receive a needle, said groove extending along the length of said needle aligner in an axis substantially orthogonal to the axis of rotation of said idler roller.

15. The adjustable needle guide of claim 14 wherein said ultrasonic scanning apparatus is a mechanical sector scanner and said means for attachment of said mounting plate to said ultrasonic scanning apparatus includes a band which encircles one end of said ultrasonic scanning apparatus.

16. The adjustable needle guide of claim 15 wherein said means for aligning said mounting plate in the plane of the scan of said ultrasonic scanning apparatus includes a key on said band.